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Jonathan Ellis edited comment on CASSANDRA-7486 at 4/29/15 7:53 PM: -------------------------------------------------------------------- > IMO consistent performance should always take precedence over maximum > performance/throughput. Agreed. I think our bar here should be "Is G1 better for the average user" keeping in mind that the average user is a *lot* worse at tuning CMS than Ariel. Power users can tune for their own workload the way they always have. (Edit: this is not to say that more testing is or is not warranted, but let's approach this from, "if we were choosing a default today what would we do" and not "let's not switch unless we can prove that G1 is always better everywhere.") was (Author: jbellis): > IMO consistent performance should always take precedence over maximum > performance/throughput. Agreed. I think our bar here should be "Is G1 better for the average user" keeping in mind that the average user is a *lot* worse at tuning CMS than Ariel. Power users can tune for their own workload the way they always have. (Edit: this is not to say that more testing is not warranted, but let's approach this from, "if we were choosing a default today what would we do" and not "let's not switch unless we can prove that G1 is always better everywhere.") > Compare CMS and G1 pause times > ------------------------------ > > Key: CASSANDRA-7486 > URL: https://issues.apache.org/jira/browse/CASSANDRA-7486 > Project: Cassandra > Issue Type: Test > Components: Config > Reporter: Jonathan Ellis > Assignee: Shawn Kumar > Fix For: 2.1.x > > > See > http://www.slideshare.net/MonicaBeckwith/garbage-first-garbage-collector-g1-7486gc-migration-to-expectations-and-advanced-tuning > and https://twitter.com/rbranson/status/482113561431265281 > May want to default 2.1 to G1. > 2.1 is a different animal from 2.0 after moving most of memtables off heap. > Suspect this will help G1 even more than CMS. (NB this is off by default but > needs to be part of the test.) -- This message was sent by Atlassian JIRA (v6.3.4#6332)